As known from:
VA
US Gambling Sites / Betting Guide / Kelly Strategy Calculator

Kelly Strategy Calculator: How To Use The Kelly Betting Strategy

Publish Date: 30/05/2021
Fact checked by: Josh Schwartz

Variable betting is a powerful tool for winning more and losing less in sports betting, or at least that’s the goal of the Kelly strategy. Players adjust their wagers up and down based on their information to win more reliably.

The Kelly Criterion relies on bankroll information, odds information, and probability to determine how much money to wager with each bet. Bettors who want to win as much as possible can benefit from this strategy. Below, we cover how the strategy works, break down the formula, and explain some alternatives to the Kelly Strategy as well.

Top 5 Betting Sites today in the US

BetMGM Sportsbook
1.
4.9/5
Up To $1500 in Bonus Bets Paid Back if your First Bet Does Not Win
USA
USA Players Welcome
PayNearMe
Skrill
PayPal
Virginia (US) Lottery Board
Bet now
Gambling problem? Call 1-800-GAMBLER (Available in the US) Call 877-8-HOPENY or text HOPENY (467369) (NY) Call 1-800-327-5050 (MA) 21+ only. Please Gamble Responsibly. Call 1-800-NEXT-STEP (AZ), 1-800-BETS-OFF (IA), 1-800-981-0023 (PR). Rewards are non-withdrawable bonus bets that expire in 7 days. In partnership with Kansas Crossing Casino and Hotel. See BetMGM.com for Terms. US promotional offers not available in DC, Mississippi, New York, Nevada, Ontario, or Puerto Rico.
Bet365
2.
4.8/5
Bet $5 & Get $150
USA
USA Players Welcome
Virginia (US) Lottery Board
Bet now
Whatever the moment. It's Never Ordinary at bet365. That's why if you sign up now you will receive $150 in Bonus Bets Win or Lose when you bet $5! Minimum $10 deposit required. Minimum odds -500 of greater. Bonus Bets wager excluded from returns. New customers only. T&CS, time limits and exclusions apply. GAMBLING PROBLEM? CALL OR TEXT 1-800-GAMBLER (AZ/CO/IL/IN/KS/KY/LA/MD/NC/NJ/OH/PA/TN/VA) or 1-800-BETS OFF (IA). 21+ (18+ KY). Must be present in AZ/CO/IA/IL/IN/KS/KY/LA (select parishes)/MD/NC/NJ/OH/PA/TN/VA.
Caesars
3.
4.7/5
Bet $1, Double your Winnings on your Next 20 Wagers. Up to $25 Max Bet Per Boost
USA
USA Players Welcome
E-Check
PayNearMe
PayPal
Virginia (US) Lottery Board
Bet now
21+ New users only. Must register using eligible promo code. First bet after registration must qualify. Max. Bonus Bet: $1,000. Bonus Bet expires 14 days after receipt. Void where prohibited. See Caesars.com/promos for full terms. Gambling Problem? 1-800-GAMBLER (1-800-426-2537)
FanDuel Sportsbook
4.
4.6/5
Bet $5 Get $150 in Bonus Bets If Your Bet Wins!
USA
USA Players Welcome
Prepaid Card
PayNearMe
PayPal
Virginia (US) Lottery Board
Bet now
Gambling Problem? Call 1-800-GAMBLER or visit RG Help . Call 1-888-789-7777 or visit Helpline and Chat - CONNECTICUT COUNCIL (CT). Hope is here. Home or call (800) 327-5050 for 24/7 support (MA). Visit Home (MD). Call 1-877-8HOPE-NY or text HOPENY (467369) (NY). 21+ (18+ D.C.) and present in select states (for KS, in affiliation with Kansas Star Casino). First online real money wager only. $5 first deposit required. Bonus issued as nonwithdrawable bonus bets which expire 7 days after receipt. See terms at FanDuel Sportsbook
DraftKings Sport
5.
4.6/5
New Customers: Bet $5+ and get $200 in Bonus Bets if it wins!
USA
USA Players Welcome
PayPal
VIP Preferred
Play+
Virginia (US) Lottery Board
Bet now
GAMBLING PROBLEM? CALL 1-800-GAMBLER, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD). 21+ and present in most states. (18+ DC/KY/NH/WY). Void in ONT/OR/NH. Eligibility restrictions apply. On behalf of Boot Hill Casino & Resort (KS). Pass-thru of per wager tax may apply in IL. 1 per new customer. Must register new account to receive reward Token. Must select Token BEFORE placing min. $5 bet to receive $200 in Bonus Bets if your bet wins. Min. -500 odds req. Token and Bonus Bets are single-use and non-withdrawable. Token expires 1/11/26. Bonus Bets expire in 7 days (168 hours). Stake removed from payout. Terms: sportsbook.draftkings.com/promos. Ends 1/4/26 at 11:59 PM ET. Sponsored by DK.

What is Variable Staking?

Variable staking is a betting strategy that relies on betting different amounts each time to adjust with a changing bankroll, odds and wagering success. There are dozens of different variable staking techniques, some of which work better than others. Serious sports bettors should try out different wagering strategies to see which ones work best for them and which ones simply don’t feel right. Often several strategies are used with different betting lines, but not always. We have these betting lines explained here.

Variable staking is a wagering technique that tries to increase the profit potential of positive outcomes, while reducing losses overall. Some strategies rely on changing the overall wager amount based on bankroll size, and others change things up depending on odds, past success and other variables. The Kelly Strategy is an advanced variable staking strategy that takes all of those different things into account.

Understanding the Kelly Strategy

For gamblers that don’t mind relying on more advanced strategies, the Kelly formula can be a powerful tool for winning more effectively while wagering online. This variable staking strategy has gamblers change the amount they wager based on the odds of the specific wager as well as their total bankroll size. By accounting for these two important variables the strategy can more effectively adjust to help enhance positive outcomes and minimize losses.

How Does it Work?

The Kelly Criterion relies on an advanced formula to explain how much to wager in each specific situation. In order for the formula to work, the player must determine the chances of winning or losing a specific wager as accurately as possible.

The more accurate the prediction is, the more effective the Kelly strategy is to use. Gamblers who want to make use of this unique betting strategy just have to get information about the wager, like the odds and the probability of winning the wager, and combine them with information about their current bankroll amount to get a suggested wager amount.

The better the chances are of winning the wager, the more money players are recommended with this betting strategy. That’s what makes it so effective and what helps gamblers to be enriched over time.

What is the Benefit of the Kelly Strategy?

Kelly Strategy: Pros & Cons
  • Prevents bets that are not likely to be profitable
  • Protect against big losses
  • More frequent wins
  • A popular choice amongst expert bettors
  • Ignores market fluctuations and their effects
  • Difficult to handle multiple bets at the same time
  • Not an ideal strategy for beginners

When used effectively, the Kelly strategy can enrich gamblers. That’s because the strategy minimizes losses and maximizes desirable results as regularly as possible. By accounting for the odds of winning or losing, the criterion raises bets and lowers them to make sure as much money is coming in as possible while letting go of as little as possible.

This strategy can be used for all sorts of different sports bets, and it isn’t difficult to use either after getting familiar with it, but getting those odds right is the most important step to making it work. Get accurate odds, and you’ll win more consistently. Mess up the odds frequently and you’ll lose considerably more than necessary while using the strategy.

BetMGM Sportsbook
1.
4.9/5
Up To $1500 in Bonus Bets Paid Back if your First Bet Does Not Win
USA
USA Players Welcome
Min. Deposit: $5
Copy
Get bonus now
Gambling problem? Call 1-800-GAMBLER (Available in the US) Call 877-8-HOPENY or text HOPENY (467369) (NY) Call 1-800-327-5050 (MA) 21+ only. Please Gamble Responsibly. Call 1-800-NEXT-STEP (AZ), 1-800-BETS-OFF (IA), 1-800-981-0023 (PR). Rewards are non-withdrawable bonus bets that expire in 7 days. In partnership with Kansas Crossing Casino and Hotel. See BetMGM.com for Terms. US promotional offers not available in DC, Mississippi, New York, Nevada, Ontario, or Puerto Rico.
Bet365
2.
4.8/5
Bet $5 & Get $150
USA
USA Players Welcome
Wagering (WR): 1x Promo
Open Bet365
Get bonus now
Whatever the moment. It's Never Ordinary at bet365. That's why if you sign up now you will receive $150 in Bonus Bets Win or Lose when you bet $5! Minimum $10 deposit required. Minimum odds -500 of greater. Bonus Bets wager excluded from returns. New customers only. T&CS, time limits and exclusions apply. GAMBLING PROBLEM? CALL OR TEXT 1-800-GAMBLER (AZ/CO/IL/IN/KS/KY/LA/MD/NC/NJ/OH/PA/TN/VA) or 1-800-BETS OFF (IA). 21+ (18+ KY). Must be present in AZ/CO/IA/IL/IN/KS/KY/LA (select parishes)/MD/NC/NJ/OH/PA/TN/VA.
Caesars
3.
4.7/5
Bet $1, Double your Winnings on your Next 20 Wagers. Up to $25 Max Bet Per Boost
USA
USA Players Welcome
Wagering (WR): 1x Deposit
Copy
Get bonus now
21+ New users only. Must register using eligible promo code. First bet after registration must qualify. Max. Bonus Bet: $1,000. Bonus Bet expires 14 days after receipt. Void where prohibited. See Caesars.com/promos for full terms. Gambling Problem? 1-800-GAMBLER (1-800-426-2537)
FanDuel Sportsbook
4.
4.6/5
Bet $5 Get $150 in Bonus Bets If Your Bet Wins!
USA
USA Players Welcome
Wagering (WR): 1x Deposit, Min. Deposit: $5
Open FanDuel Sportsbook
Get bonus now
Gambling Problem? Call 1-800-GAMBLER or visit RG Help . Call 1-888-789-7777 or visit Helpline and Chat - CONNECTICUT COUNCIL (CT). Hope is here. Home or call (800) 327-5050 for 24/7 support (MA). Visit Home (MD). Call 1-877-8HOPE-NY or text HOPENY (467369) (NY). 21+ (18+ D.C.) and present in select states (for KS, in affiliation with Kansas Star Casino). First online real money wager only. $5 first deposit required. Bonus issued as nonwithdrawable bonus bets which expire 7 days after receipt. See terms at FanDuel Sportsbook
DraftKings Sport
5.
4.6/5
New Customers: Bet $5+ and get $200 in Bonus Bets if it wins!
USA
USA Players Welcome
Min. Deposit: 5
Open DraftKings Sport
Get bonus now
GAMBLING PROBLEM? CALL 1-800-GAMBLER, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD). 21+ and present in most states. (18+ DC/KY/NH/WY). Void in ONT/OR/NH. Eligibility restrictions apply. On behalf of Boot Hill Casino & Resort (KS). Pass-thru of per wager tax may apply in IL. 1 per new customer. Must register new account to receive reward Token. Must select Token BEFORE placing min. $5 bet to receive $200 in Bonus Bets if your bet wins. Min. -500 odds req. Token and Bonus Bets are single-use and non-withdrawable. Token expires 1/11/26. Bonus Bets expire in 7 days (168 hours). Stake removed from payout. Terms: sportsbook.draftkings.com/promos. Ends 1/4/26 at 11:59 PM ET. Sponsored by DK.

Exploring the Formula

The Kelly Criterion relies on a specific formula to determine how much money should be wagered each time. Deciding what to bet is as simple as plugging in the different numbers and placing the wager suggested at the end.

The formula is as follows: (bp – q) / b = f

What the Formula Means

  • b = the decimal odds of the bet minus 1
  • p = the probability of a wager being successful in decimal form. A 60% probability is 0.60
  • q = the probability of a wager losing, it’s simply 1 – p or .40 in this instance.

f = the fraction of your total bankroll you should wager.

To make use of the formula players need only plug in all the different bits of information about a specific wager. Plug that information in and they will know exactly how much of their bankroll they should be wagering for the specific bet opportunity. The amount to wager changes dramatically depending on the conditions of the bet, and that’s the whole point of the Kelly Strategy. The strategy makes it easier to fully leverage the power of a good winning opportunity while working hard to help avoiding betting too much on a bet that offers too little of a reward for the risk.

Testing it Out

Now that we’ve explained the formula a bit, it’s time to test it out in a simple example to really showcase how it works.

Imagine that we’re placing a wager with a 60% chance of winning and 2.00 odds.

Our bankroll is $2,500 giving us a decent amount that we can wager comfortably.

To find out exactly how much to wager we only need to plug the numbers into the formula.

(bp – q) / b = f

b is 1 in this instance because that’s 2.00 – 1

p is .60 and q is .40 giving you all the information you need to plug everything in.

You get ((1*.6) - .4) / 1 = f

Or .2 = f when you do out the math.

That means with those odds and that probability you should wager approximately 20% of your total bankroll. In this case that would be $500. Even slight fluctuations in odds or the probability of winning can adjust the total amount that should be wagered in a big way. After looking at the formula in action it’s easy to see how some gamblers might say that the strategy is aggressive. Most betting experts would never recommend wagering $500 at a time with a $2,500 bankroll, but that doesn’t mean that the system won’t work for you.

Kelly calculator

 / 

Is the Kelly Strategy Right for Everyone?

It’s important for gamblers to take the time to decide if the Kelly strategy is right for them before implementing it all the time. Here's why:

  • It’s a much more aggressive strategy than fixed wagering, but it can pay off big time for gamblers who are good at predicting their probability of winning any one bet.
  • If they predict the probability properly, they will likely succeed using the Kelly Criterion. However, some gamblers will have a hard time making the wagers needed to make the most of the strategy.
  • There are instances where a wager of 50% or more must be laid down to get the most from the betting strategy. When that’s the case, only gamblers comfortable with making those sorts of wagers will benefit from the system. Everyone else should go with a more reserved betting strategy that they can be more comfortable with.
  • The Kelly Strategy is also more difficult to make use of than something like the Martingale betting strategy or fixed wagering. You can read an overview of the Martingale betting strategy here.

List of Alternative Strategies

Just in case you need to try out another strategy, you can have a look at;

  • Martingale System
  • Fibonacci System
  • Labouchere System
  • Labouchere Reverse System
  • D’alembert System
  • The 2/3 Betting System
  • Flat Betting
  • Value Betting
  • Matched Betting
  • Progressive Betting strategies
  • Arbitrage Betting, and more.

Test out the Strategy Today

Sports bettors should take some time to test out the Kelly Criterion to see if the strategy will work for them. This powerful betting strategy is a tool that can result in some exciting earnings, but it’s something that only works well for some gamblers. Take the time to look through different sportsbooks, decide on one to join and start testing out this strategy to see how well it will work for you. Sign up today and start working toward bigger and better profits.

Conclusion: The Kelly Strategy is Complicated but Effective

The Kelly Strategy is an advanced variable staking strategy used by sports bettors to help them place more effective wager amounts. It’s worth trying out, and it’s a tool that gamblers can use easily if they get a calculator to determine the recommended wager amount each time. It aims to enhance wins and minimize losses by adjusting wager amounts based on probabilities and bankroll size.

While it requires understanding and calculation, many experienced bettors find success with it. However, it's not suitable for everyone, especially those uncomfortable with aggressive betting or who struggle with accurately predicting probabilities. Nevertheless, for those willing to invest the time and effort to master it, the Kelly Strategy can be a valuable tool for achieving consistent profits in sports betting.

Frequently Asked Questions

👀Does the Kelly Criterion work?

Yes, it does. While many investors integrate the Kelly Criterion into thriving moneymaking strategies, it is not foolproof and can result to losses. multiple investors have defined investment goals, like saving for retirement, that are not well-served by seeking optimal returns.

🤨What are the flaws of the Kelly Criterion?

Its major flaw is that its suggested wagers may be very big. This implies that, the Kelly criterion can be very dangerous in the short term.

😉What is a good Kelly percentage?

No matter what size position the Kelly Percentage is encouraging you to enter, don’t ever risk above 20% of your total available capital on a single stock. Doing this puts in too much risk into your portfolio due to a lack of diversification.

Top Betting Sites
Top Betting Promos
BetMGM Sportsbook
BetMGM Sportsbook Promo
Up To $1500 in Bonus Bets Paid Back if your First Bet Does Not Win
T&Cs apply
4.9/5
Gambling problem? Call 1-800-GAMBLER (Available in the US) Call 877-8-HOPENY or text HOPENY (467369) (NY) Call 1-800-327-5050 (MA) 21+ only. Please Gamble Responsibly. Call 1-800-NEXT-STEP (AZ), 1-800-BETS-OFF (IA), 1-800-981-0023 (PR). Rewards are non-withdrawable bonus bets that expire in 7 days. In partnership with Kansas Crossing Casino and Hotel. See BetMGM.com for Terms. US promotional offers not available in DC, Mississippi, New York, Nevada, Ontario, or Puerto Rico.
Bet365
Bet365 Promo
Bet $5 & Get $150
T&Cs apply
4.8/5
Whatever the moment. It's Never Ordinary at bet365. That's why if you sign up now you will receive $150 in Bonus Bets Win or Lose when you bet $5! Minimum $10 deposit required. Minimum odds -500 of greater. Bonus Bets wager excluded from returns. New customers only. T&CS, time limits and exclusions apply. GAMBLING PROBLEM? CALL OR TEXT 1-800-GAMBLER (AZ/CO/IL/IN/KS/KY/LA/MD/NC/NJ/OH/PA/TN/VA) or 1-800-BETS OFF (IA). 21+ (18+ KY). Must be present in AZ/CO/IA/IL/IN/KS/KY/LA (select parishes)/MD/NC/NJ/OH/PA/TN/VA.
Caesars
Caesars Promo
Bet $1, Double your Winnings on your Next 20 Wagers. Up to $25 Max Bet Per Boost
T&Cs apply
4.7/5
21+ New users only. Must register using eligible promo code. First bet after registration must qualify. Max. Bonus Bet: $1,000. Bonus Bet expires 14 days after receipt. Void where prohibited. See Caesars.com/promos for full terms. Gambling Problem? 1-800-GAMBLER (1-800-426-2537)
Our Team
CaptainGamblingDrew the DFS Guy
CaptainGambling
CaptainGambling
Editor
Drew the DFS Guy
Drew the DFS Guy
DFS Expert
Get the latest updates in Sports and Casino via our Newsletter

21+ and present in VA. Gambling Problem? Call 1-800-GAMBLER.

This site is using Cloudflare and adheres to the Google Safe Browsing Program. We adapted Google's Privacy Guidelines to keep your data safe at all times.
Virginia Town HallCloudflareSSLco² neutral
Close
Our Sports Pros recommend these awesome sports betting sites this week:
Bet365
Bet365 Promo
Bet $5 & Get $150
T&Cs and 21+ apply
Code:
Open Bet365
Open Bet365
×
Your Promo Code:
The bonus offer of was already opened in an additional window. If not, you can open it also by clicking the following link:
Play now